Rare Spiral Torsions. 
539 
whether the race we are dealing with is a half or an inter- 
mediate race. Nevertheless the rarity of the anomaly 
in repeated sowings strongly indicates the former alter- 
native. This was certainly the case in Lupinus lutcus, 
u 
Fig. 127. Casitarina qitadrivalvis. A branch with a lateral 
torsion, a. From the botanical garden in Amsterdam, 
1897- 
Silcnc noctiflora and other species which occasionally 
produced spiral torsions in my cultures. In Valeriana 
officinalis (Fig. 122, p. 528), which has already been 
mentioned, the proportion of anomalous individuals raised 
